Widefield 10x, 15x, or 20x eyepieces, paired. 30.5mm diameter. For use with National Optical models:
400 Series
405 Series
409 Series
410 Series
411 Series
415 Series
416 Series
417 Series
420...
Fein Optic paired high-eyepoint 15x / 16mm eyepieces for the M40 metallurgical microscope and the M40RT metallurgical microscope. These 15x PL eyepieces fit in a 30mm ID eyetube and accept a 25mm...